episode
Pronunciation: /ˈɛpɪsəʊd/
noun
- 1an event or a group of events occurring as part of a sequence; an incident or period considered in isolation: the whole episode has been a major embarrassment
- a finite period in which someone is affected by a specified illness: acute psychotic episodes
- 2each of the separate instalments into which a serialized story or radio or television programme is divided: the final episode of the series
- Music a passage containing distinct material or introducing a new subject: this change is followed by an episode in this new key
- a section between two choric songs in Greek tragedy.

Origin:
late 17th century (denoting a section between songs in Greek tragedy): from Greek epeisodion, neuter of epeisodios 'coming in besides', from epi 'in addition' + eisodos 'entry' (from eis 'into' + hodos 'way')